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Preparation and Characterization of CdS and CdSe Semiconductor Nanoparticles

Author: NieXiaoBo
Tutor: ChenYanMing
School: Shenyang University of Technology
Course: Chemical processes
Keywords: CdS CdSe Semiconductor nanoparticles Synthesis Characterization
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 124
Quote: 0
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Abstract


CdS, CdSe , etc. a large number of semiconductor nanoparticles suspension unsaturated bond , i.e. the surface defect states , the nano particle fluorescence quantum yield . By choosing different surfactants can effectively reduce surface defects , synthesize a series of high fluorescence intensity and quantum yield of nanoparticles. In this paper, the reaction system in a different synthesis CdS, CdSe semiconductor nanoparticles such as the system of different reaction conditions and the surface active agent on the semiconductor nanoparticles and the preparation of optical properties . In AOT ( bis (2 - ethylhexyl ) succinate sulfonate) as surfactant , cadmium source cadmium acetate , thiourea and sodium thiosulfate selenium (NaSeSO3) for the sulfur source and the selenium source in the aqueous phase the synthesis of CdS and CdSe semiconductor nanoparticles . By UV - visible absorption spectroscopy, fluorescence spectroscopy, Fourier transform infrared spectroscopy, X -ray diffraction (XRD) and transmission electron microscopy (TEM) and other methods , CdS and CdSe nanoparticles on the morphology and optical properties were characterized and analyzed , the results AOT and the CdS shows CdSe (?) nanoparticles with good inner surface modification , because AOT amphipathic nature of the synthesized CdS, CdSe nano- particles can be dispersed in polar and non-polar solvents . Based interface reaction principle , the choice of octadecylamine or sodium oleate as surfactant , in toluene and ethylene glycol ( or water ) at the interface two synthetic CdS, CdSe, MnS, Ag2S other semiconductor nanoparticles. UV - visible absorption spectroscopy, fluorescence spectroscopy , X-ray diffraction and transmission electron microscopy results show prepared by the CdS, CdSe, MnS and Ag2S nanoparticles showed significant quantum size effect , the smaller the particle size , narrow distribution . With sodium oleate as surfactant , ethanol as solvent , cadmium acetate and thiourea ( or a selenium sodium hydride ) the reaction precursor Synthesis of CdS and CdSe semiconductor nanoparticles . By UV - visible absorption and fluorescence spectroscopy , found in high concentrations ( eg 5mmol / L) and low concentrations ( eg 0.1mmol / L) under the conditions of synthesis of CdS nanoparticles with different absorption and fluorescence spectral characteristics . By X-ray diffraction and transmission electron microscopy , that the synthesis of the system CdS and CdSe nanoparticles dispersed in ethanol good size distribution is relatively uniform , with a typical CdS and CdSe nanoparticles crystal structure .

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